Heavy Ball

The Heavy Ball (ヘビーボール Heavy Ball), one of the many Poké Balls featured in the Gold and Silver games can catch large and heavy Pokémon such as Snorlax better than a Poké Ball. It has a dark blue top with lighter blue circles on either side at an angle from the central button, the topmost of which is the largest and the lower-most of which are tiny and almost the same shade of blue as the majority of the top.